Airtel or any network with free gprs!!!!

Yes my friends at school tell me they have like free proxy server and proxy ports tat make them anonymous online while they surf the internet on their phone and they get it free.

But once i try and put these proxies which are elite or anoymous,when i use my internet,it works but after a while my balance (money) get deducted. i want way to use free internet without the network knowing and not deducting my money on account.

Why?

I want to have lke free internet on my phone and like the operator does nt know who is using it.. like i use the gprs ?(internet on phone) without the network knowing who is using it.